1. Analytical Chemistry — Analytical Reviews (Bi-annual).
2. buwalda, Review of Literature, XRFS 4th ed., Philips, Eindhoven, 1967.
3. volborth, a., 1963, Nevada Bureau of Mines Report 6, part A.
4. adler, i. and axelrod, j. m., 1955, Spectrochim. Acta, 7, 91.
5. jones, r. a., 1959, Analyt. Chem. 31, 1341.